US4438158A
Expired / Lapsed
US
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Method for fabrication of electrical resistor
Assignee: Von Roll Isola USA Inc
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Filing: 1982-10-27
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Granted: 1984-03-20
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Expires: 2002-10-27
Abstract
Abstract An electrical resistor family based on oxides of tungsten and/or molybdenum is prepared by combining a polymeric binder with such oxides in an appropriate amount to realize the desired bulk properties. The resistance of the composite can be varied by varying the metal content of the oxides and/or by appropriate combination of the various oxides. Inert fillers are not required and the bulk properties are more stable.
Inventors
- 👤 Charles W. Eichelberger
- 👤 Robert J. Wojnarowski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:50
CPC Classifications
H; H01; H01C; H01C17/00; H01C17/06; H01C17/065; H01C17/06506; H01C17/06513; H01C17/06533
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A method for preparing an electrical resistor, comprising the steps of: combining a curable polymeric binder and finely-divided particles, having a particle size of less than 50 microns, of at least one member of the group consisting of the brown oxide of molybdenum and the brown, purple, blue and yellow oxides of tungsten; adjusting the amount of said oxides to be about 60-80 volume percent of the mixture of said oxides and said binder and sufficient to provide a desired bulk resistivity after curing; applying the resulting admixture to a substrate; and curing said binder.
Claim 2
Independent Claim
95 words
A method for preparing an electrical resistor, comprising the steps of: combining a curable polymeric binder and finely-divided particles, having a particle size of less than 50 microns, of at least one member of the group consisting of the brown oxide of molybdenum and the brown, purple, blue and yellow oxides of tungsten; adjusting the amount of said oxides to be about 60-80 volume percent of the mixture of said oxides and said binder and sufficient to provide a desired bulk resistivity after curing; applying the resulting admixture to a substrate; and curing said binder.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein the amount of said oxides is about 70%.
Claim 4
Dependent Claim
13 words
The method of claim 1, wherein said oxides are employed in powdered form.
Claim 5
Dependent Claim
28 words
The method of claim 3, wherein said at least one member of the group is at least one of the brown, purple, blue and yellow oxides of tungsten.
Claim 6
Dependent Claim
20 words
The method of claim 3, wherein said at least one member of the group is the brown oxide of molybdenum.
Claim 7
Dependent Claim
30 words
The method of claim 3, wherein said at least one member of the group is a mixture of at least the brown oxide of tungsten and said brown molybdenum oxide.
Claim 8
Dependent Claim
35 words
The method of claim 1, further comprising the step of combining said curable binder and oxides with a solvent in an amount sufficient to establish a desired viscosity and flow characteristic of the resulting admixture.
Claim 9
Dependent Claim
23 words
The method of claim 7, further comprising the step of drying said admixture after application to the substrate and before curing said binder.
Claim 10
Dependent Claim
20 words
The method of claim 1, wherein said curable polymeric binder is a polyester resin and said binder is cured thermally.
Claim 11
Independent Claim
67 words
A method of fabricating an electrical resistor of desired resistance value which comprises the steps of: providing an oxide material comprising at least one member or a mixture of members of the group consisting of the brown, purple, blue and yellow oxides of tungsten; admixing an amount of the oxide material, selected to provide a desired resistance value, with a curable polymeric binder; and curing the binder.
Claim 12
Independent Claim
67 words
A method of fabricating an electrical resistor of desired resistance value which comprises the steps of: providing an oxide material comprising at least one member or a mixture of members of the group consisting of the brown, purple, blue and yellow oxides of tungsten; admixing an amount of the oxide material, selected to provide a desired resistance value, with a curable polymeric binder; and curing the binder.
Claim 13
Independent Claim
66 words
A method of fabricating an electrical resistor of desired resistance value which comprises the steps of: providing an oxide material comprising a mixture of the brown oxide of molybdenum and at least one of the brown, purple, blue and yellow oxides of tungsten; admixing an amount of the oxide material, selected to provide a desired resistance value, with a curable polymeric binder; and curing the binder.
Claim 14
Independent Claim
66 words
A method of fabricating an electrical resistor of desired resistance value which comprises the steps of: providing an oxide material comprising a mixture of the brown oxide of molybdenum and at least one of the brown, purple, blue and yellow oxides of tungsten; admixing an amount of the oxide material, selected to provide a desired resistance value, with a curable polymeric binder; and curing the binder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |